.container {
    width: 100%;
  }
  .container .header {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 10px 0px;
    width: 100%;
    background-color: #0b87ff;
  }
  .container .header h2 {
    margin-bottom: 10px;
    color: white;
  }
  .container .header .input input {
    padding: 5px 20px;
    margin-right: 10px;
    border-radius: 5px;
    width: 400px;
    height: 30px;
    border: none;
    outline: none;
  }
  .container .header .input button {
    width: 80px;
    height: 30px;
    color: #0b87ff;
    border-radius: 5px;
    border: none;
    outline: none;
    vertical-align: middle;
  }
  
  /* 内容区 */
  .content {
    width: 100%;
  }
  .content li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0px 40px;
    height: 50px;
    width: 100%;
    border-bottom: 1px solid #eeeeee;
  }
  .content li:hover {
    background-color: #dddddd;
  }
  .content li .left {
    display: flex;
  }
  .content li .left .chose {
    margin-right: 30px;
    position: relative;
    width: 20px;
    height: 20px;
    border: 1px solid black;
    border-radius: 2px;
  }
  .selected {
    background-color: #767676;
  }
  .selected::before {
    content: ""; /* Unicode character for tick */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 5px;
    height: 10px;
    border: 4px solid white;
    border-left: none;
    border-top: none;
    display: block;
  }
  .content li .right {
    width: 50px;
    height: 20px;
    background-color: #efefef;
    outline: none;
    border: 1px solid black;
  }
  
  .content .clear {
    background-color: #87ceeb;
  }
  .content .clear:hover {
    background-color: #87ceeb;
  }
  .content .clear button {
    width: 80px;
  }
  .content .clear .clear-done {
    margin-right: 20px;
  }
  
  .done {
    color: red;
    text-decoration: line-through red;
  }
  ul h1 {
    text-align: center;
    background-color: white;
    border-bottom: none;
  }